Question

Sawdust, mixed in water, cannot be separated by the sedimentation method
Why?
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Answer 1

As the sawdust is lighter so it floats. But in sedimentation the substance used to settle down in water. Whereas the sawdust will not settle down in water when the mixture of sawdust and water is kept undisturbed. So, sawdust can not be separated by the process of sedimentation.